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        <h1 class="til"><span>知识结构</span></h1>
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             <h1><img src="img/image901.jpg" width="553" height="252" /></h1>
            <div class="fB con_right_content box1"><strong>重点、难点、考点</strong></div>
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            <p align="left" class="dirct_p">1．钠的物理性质、化学性质。<br />
              2．<img src="img/dirct_chapter_clip_image002.gif" />、<img src="img/dirct_chapter_clip_image004.gif" />结构、性质、用途。<br />
              3．以<img src="img/dirct_chapter_clip_image006.gif" />为例，了解重要的碱的性质和用途。<br />
              4．<img src="img/dirct_chapter_clip_image008.gif" />、<img src="img/dirct_chapter_clip_image010.gif" />的性质和用途。<br />
              5．从原子的核外电子排布，理解ⅠA族元素(单质、化合物)的相似和递变性。<br />
              6．常见金属的焰色及焰色反应。</p>
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                    <td><strong>上一个：</strong>没有了</td>
                    <td><strong>当前知识点：</strong>物质的分类、组成和结构</td>
                    <td><strong>下一个：</strong><a href="#"  target="main" >物质的性质和变化</a></td>
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            <h2 class="dirct_list_tit fB"><strong>当前知识点还包含以下内容：</strong></h2>
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            	<li><a href="#"  target="main" >纯净物、混合物、单质、化合物</a></li>
                <li><a href="#"  target="main" >氧化物</a></li>
                <li><a href="#"  target="main" >分子和原子</a></li>
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